Chief Bandit equip/training advice?

Kent Dungeon has all three spawning. Blue Kents have a good spawn and map layout for training, and the MD has a similar layout, with leveled platforms. The mixed spawn is less favourable to other jobs since they train based on elemental advantage, but that shouldn't pose a problem for you. All that should remain, theoretically, is personal preference and %/hr. Go try both maps out and see which is better for you.